The height and the rotation can be adjust.So that it can allow users to naturally fit the head of the cervical pillow, the standard sitter sitting, and it will be anti-office to enjoy. When the height of the headrest fully supports your cervical spine , the position is the best.

2.Backrest

The best support position of the lumbar is the third and the fourth spine. The height of the whole back can be adjustable to easy to meet the needs of different users and reduce the majority of human body weight of the lumbar bear.

Push back test is exerting a certain force to the backrest through the push back test machine. The chair is tilted backward squeeze. Its purpose is to detect the ability of the chair parts to withstand the extrusion.

According to the size of force, push back test can be divided into two type: functional testing and destructive testing .

Functional test test force is 91kg and last 1minute. After testing, ifthe chair partsdeform, damage or break, the test will not pass.

Destructive testing is 136kg and last 1minute. After testing, ifthe chair partsdeform, damage or break, the test will not pass.